Table 10.5.2 gives the rental vacancy rates by US region (source: US Census Bureau) for 5 years.
(a) Test at the 0.01 level whether the true rental vacancy rates by region are the same for all 5 years.
(b) If there is a difference, use Tukey€™s method to find which regions are different.
Table 10.5.2

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Rental units 1995 1996 1997 6.7 8.0 9.1 6.6 1998 1999 Midwest South West 7.2 7.2 8.3 7.5 7.4 7.9 8.6 7.2 6.7 7.9 9.6 6.7 6.3 8.6 10.3 6.2